Вы можете использовать Путь , например:
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
paint.setColor(Color.WHITE);
Path line2d = new Path();
// just example for line could be complex shape
line2d.moveTo(pointF1.x, pointF1.y);
line2d.lineTo(pointF2.x, pointF2.y);